Answer:
x = 9 or x = 0 or x = -2
Step-by-step explanation:
Solve for x:
3 x^3 - 21 x^2 - 54 x = 0
The left hand side factors into a product with four terms:
3 x (x - 9) (x + 2) = 0
Divide both sides by 3:
x (x - 9) (x + 2) = 0
Split into three equations:
x - 9 = 0 or x = 0 or x + 2 = 0
Add 9 to both sides:
x = 9 or x = 0 or x + 2 = 0
Subtract 2 from both sides:
Answer: x = 9 or x = 0 or x = -2
Answer:
Step-by-step explanation:
The total surface area of a cone is given by:
Surface area = 
where r is the radius of the cone, h is the height of the cone, l is the length of the cone = 
Given that h = 136 mm, r = 60 mm /2 = 30 mm, l = 140 mm. Also the top of the cone is not included in the surface area, hence the surface area becomes:
Answer:
x = 76.5
Step-by-step explanation:
= 22 - 5
= 17
x = 17 x 4.5
x = 76.5
That is sort of a vague question, but in general you can:
1. Analyze the problem to identify:
a) What type of problem it is (word problem, algebra,etc.)
b) What the question is asking you (you must understand the question to do it)
2. Draw visuals (ex. venn diagram), graphs and tables to help you start the question
3. Create a plan to solve the question. For example the formulas and materials you need.
4. Try to solve the problem. This can be achieved in many ways.
5. If you are having problems, refer to the internet or ask a friend, teacher, parent or tutor.
